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Commit 277f850f authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge git://git.kvack.org/~bcrl/aio-fixes 

Pull aio fix from Ben LaHaise:
 "Dirty page accounting fix for aio"

* git://git.kvack.org/~bcrl/aio-fixes:
  aio: fix uncorrent dirty pages accouting when truncating AIO ring buffer
parents d1ca0007 835f252c

fs/aio.c

+14 −7
Original line number Diff line number Diff line
@@ -165,6 +165,15 @@ static struct vfsmount *aio_mnt; 
static const struct file_operations aio_ring_fops;

static const struct address_space_operations aio_ctx_aops;



/* Backing dev info for aio fs.

 * -no dirty page accounting or writeback happens

 */

static struct backing_dev_info aio_fs_backing_dev_info = {

	.name           = "aiofs",

	.state          = 0,

	.capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_MAP_COPY,

};



static struct file *aio_private_file(struct kioctx *ctx, loff_t nr_pages)

{

	struct qstr this = QSTR_INIT("[aio]", 5);
@@ -176,6 +185,7 @@ static struct file *aio_private_file(struct kioctx *ctx, loff_t nr_pages) 


	inode->i_mapping->a_ops = &aio_ctx_aops;

	inode->i_mapping->private_data = ctx;

	inode->i_mapping->backing_dev_info = &aio_fs_backing_dev_info;

	inode->i_size = PAGE_SIZE * nr_pages;



	path.dentry = d_alloc_pseudo(aio_mnt->mnt_sb, &this);
@@ -220,6 +230,9 @@ static int __init aio_setup(void) 
	if (IS_ERR(aio_mnt))

		panic("Failed to create aio fs mount.");



	if (bdi_init(&aio_fs_backing_dev_info))

		panic("Failed to init aio fs backing dev info.");



	kiocb_cachep = KMEM_CACHE(kiocb, SLAB_HWCACHE_ALIGN|SLAB_PANIC);

	kioctx_cachep = KMEM_CACHE(kioctx,SLAB_HWCACHE_ALIGN|SLAB_PANIC);
@@ -281,11 +294,6 @@ static const struct file_operations aio_ring_fops = { 
	.mmap = aio_ring_mmap,

};



static int aio_set_page_dirty(struct page *page)

{

	return 0;

}



#if IS_ENABLED(CONFIG_MIGRATION)

static int aio_migratepage(struct address_space *mapping, struct page *new,

			struct page *old, enum migrate_mode mode)
@@ -357,7 +365,7 @@ out: 
#endif



static const struct address_space_operations aio_ctx_aops = {

	.set_page_dirty = aio_set_page_dirty,

	.set_page_dirty = __set_page_dirty_no_writeback,

#if IS_ENABLED(CONFIG_MIGRATION)

	.migratepage	= aio_migratepage,

#endif
@@ -412,7 +420,6 @@ static int aio_setup_ring(struct kioctx *ctx) 
		pr_debug("pid(%d) page[%d]->count=%d\n",

			 current->pid, i, page_count(page));

		SetPageUptodate(page);

		SetPageDirty(page);

		unlock_page(page);



		ctx->ring_pages[i] = page;